Design and preparation of dual-role anode materials with extraordinary performance for rechargeable Li/Na-ion batteries(LIBs/NIBs)re-mains highly challenging.Herein,three-dimensional(3D)pomegranate-like porous bimetallic NiCo2Se4 spheres with N-doped carbon(termed as NC@NiCo2Se4)are synthesized by solvothermal method and annealing.Microstructure investigations reveal that the NC@NiCo2Se4 spheres include nano-sized NiCo2Se4 particles as inner core and NiCo2Se4 with the modification of thin-walled N-doped carbon layer as inner/outer shell.The bimetallic NC@NiCo2Se4 spheres possess synergistic interaction of Ni/Co atoms to enhance intrinsic conductivity and electro-chemical activity,unique pomegranate-like structure with an inner void space and robust shell to mitigation volume expansion,and intimate contact of N-doped carbon layer to improve interface effect and accelerate conversion kinetics.As anode materials,the NC@NiCo2Se4 exhibits superior lithium/sodium storage performances(1401.6 and 794.8 mA h g-1 at current density of 0.5 and 5 A g-1 after 500 cycles for LIBs as well as 433.9 mA h g-1 at 3 A g-1 after 1000 cycles and a high capability of 306.6 mA hg-1 at 20 A g1 for NIBs).This work represents an impressive strategy for future research of bimetallic selenides as anode materials for advanced high-performance LIBs/NIBs.

Xin Liu;Liwen Yang;Guobao Xu;Juexian Cao

School of Physics and Optoelectronics&Hunan Institute of Advanced Sensing and Information Technology,Xiangtan University,Xiangtan,411105,China;School of Materials Science and Engineering,Xiangtan University,Xiangtan,411105,China

绿色能源与环境（英文）

[1]Xin Liu;Liwen Yang;Guobao Xu;Juexian Cao-.Pomegranate-like porous NiCo2Se4 spheres with N-doped carbon as advanced anode materials for Li/Na-ion batteries)[J].绿色能源与环境（英文）,2022(03):554-565

NiCo2Se4

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